TWI784142B - Liquid crystal composition, liquid crystal display element, and liquid crystal display - Google Patents

Abstract

The present disclosure relates to a liquid crystal composition, and a liquid crystal display element and a liquid crystal display comprising the liquid crystal composition belong to the field of liquid crystal displays. The liquid crystal composition disclosed in the present disclosure comprises a compound represented by formula I, a compound represented by formula II, one or more compounds represented by formula III, and at least one polymerizable compound, and the liquid crystal composition has a relatively high clearing point ( CP), large K value, suitable optical anisotropy (△n), fast response speed.

Description

Liquid crystal composition, liquid crystal display element, and liquid crystal display

The disclosure belongs to the field of liquid crystal display, and more specifically, relates to a liquid crystal composition, a liquid crystal display element and a liquid crystal display comprising the liquid crystal composition.

The early commercial TFT-LCD products basically adopted the TN display mode, and the biggest problem was the narrow viewing angle. With the increase of product size, especially in the application of TV field, IPS display mode and VA display mode with wide viewing angle have been developed and applied in turn, especially based on the improvement of VA display mode, they have been successively introduced in major The company has achieved a breakthrough development, which is mainly due to the advantages of the VA mode itself, such as wide viewing angle, high contrast, and no need for rubbing alignment. In addition, the contrast displayed by the VA mode has a great influence on the optical anisotropy (△n ), the thickness of the liquid crystal cell (d) and the wavelength (λ) of the incident light are less dependent, which will make the VA mode a very promising display technology.

However, the liquid crystal medium used in display elements such as VA mode is not perfect in itself. Compared with display elements with positive dielectric anisotropy, it has disadvantages such as relatively small dielectric, slow response time, and relatively high driving voltage. It will be more prone to problems such as poor display and afterimages.

At present, it is still desired to obtain a liquid crystal composition that is applied to a display element with excellent response speed and improved various display defects.

In order to solve the problems existing in the prior art, the present inventors have surprisingly found after in-depth research that by using a liquid crystal containing a group combination of the compound shown in the aforementioned formula I, the compound shown in the formula II and the compound shown in the formula III The composition, when applied to a liquid crystal display element, exhibits a fast response speed, thus completing the present disclosure.

The first object of the present disclosure is to provide a liquid crystal composition, which has a high clearing point (CP), a large K value, a suitable optical anisotropy (Δn), and a fast response speed.

The second object of the present disclosure is to provide a liquid crystal display device comprising the liquid crystal composition of the present disclosure, and the liquid crystal display device has a fast response speed.

Another object of the present disclosure is to provide a liquid crystal display comprising the liquid crystal composition of the present disclosure, and the liquid crystal display has a fast response speed.

In order to achieve the above purpose, the present disclosure adopts the following technical solutions: The present disclosure provides a liquid crystal composition comprising a compound represented by formula I, a compound represented by formula II, one or more compounds represented by formula III, and at least one compound that can be polymeric compound.

式III中，R₁、R₂各自獨立地表示碳原子數為1-10的烷氧基。

In Formula III, R ₁ and R ₂ each independently represent an alkoxy group with 1-10 carbon atoms.

In the liquid crystal composition disclosed in the present disclosure, there is no limitation on the aforementioned polymerizable compounds, and those skilled in the art can select suitable polymerizable compounds according to the common knowledge in the field.

The present disclosure also provides a liquid crystal display element, which includes the liquid crystal composition of the present disclosure, and the liquid crystal display element is an active matrix addressing display element or a passive matrix addressing display element.

The present disclosure also provides a liquid crystal display comprising the liquid crystal composition of the present disclosure, and the liquid crystal display is an active matrix addressing display or a passive matrix addressing display.

[Liquid Crystal Composition]

The disclosed liquid crystal composition comprises the compound represented by formula I, the compound represented by formula II, one or more compounds represented by formula III, and at least one polymerizable compound.

其中：R₁、R₂各自獨立地表示碳原子數為1-10的烷氧基。

Wherein: R ₁ and R ₂ each independently represent an alkoxy group with 1-10 carbon atoms.

Examples of the aforementioned alkoxy group having 1 to 10 carbon atoms include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, pentyloxy Base, hexyloxy, heptyloxy, octyloxy, nonyloxy, decyloxy, etc.

In the liquid crystal composition disclosed in the present disclosure, the aforementioned polymerizable compound is preferably selected from formulas RM-1 to RM-8

其中：R₃、R₄表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基；並且R₃、R₄所示基團中任意一個或多個不相連的CH₂任選被環戊基、環丁基或環丙基取代；Z₁、Z₂各自獨立地表示單鍵、-CH₂CH₂-或-CH₂O-；

表示1,4-亞環己基、1,4-亞環己烯基、1,4-亞苯基或氟代1,4-亞苯基；m、n各自獨立地表示0、1或2且m+n

2；且當m+n=1，Z₁、Z₂為單鍵，

或

表示1,4-亞苯基時，R₃、R₄不同時表示碳原子數為1-10的烷氧基。 In the liquid crystal composition of the present disclosure, preferably, one or more compounds represented by formula IV are also included:

Among them: R ₃ and R ₄ represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, and a carbon atom substituted with fluorine Alkoxy group with 1-10 carbon atoms, alkenyl group with 2-10 carbon atoms, alkenyl group with 2-10 carbon atoms substituted by fluorine, alkenyloxy group with 3-8 carbon atoms or An alkenyloxy group with 3-8 carbon atoms substituted by fluorine; and any one or more unconnected CH ₂ in the groups represented by R ₃ and R ₄ are optionally replaced by cyclopentyl, cyclobutyl or cyclopropyl Substitution; Z ₁ and Z ₂ each independently represent a single bond, -CH ₂ CH ₂ - or -CH ₂ O-;

represents 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene or fluorinated 1,4-phenylene; m and n each independently represent 0, 1 or 2 and m+n

2; and when m+n=1, Z ₁ and Z ₂ are single bonds,

or

When representing 1,4-phenylene, R ₃ and R ₄ do not simultaneously represent an alkoxy group with 1-10 carbon atoms.

其中：R₃₁表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基；R₄₁表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基；並且R₃₁、R₄₁所示基團中任意一個或多個不相連的CH₂任選被環戊基、環丁基或環丙基取代。 In the liquid crystal composition disclosed in the present disclosure, preferably, the compound represented by IV above is selected from the group consisting of compounds represented by the following formulas IV-1 to IV-14:

Wherein: R ₃₁ represents an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkenyl group with 2-10 carbon atoms, and an alkenyl group with 2-10 carbon atoms substituted by fluorine. -10 alkenyl group, alkenyloxy group with 3-8 carbon atoms or alkenyloxy group with 3-8 carbon atoms substituted by fluorine; R ₄₁ represents an alkyl group with 1-10 carbon atoms, Alkyl group with 1-10 carbon atoms substituted by fluorine, alkoxy group with 1-10 carbon atoms, alkoxy group with 1-10 carbon atoms substituted with fluorine, chain with 2-10 carbon atoms Alkenyl, fluorine-substituted alkenyl with 2-10 carbon atoms, alkenyloxy with 3-8 carbon atoms; and any one or more of the groups represented by R ₃₁ and R ₄₁ are not connected _CH2 is optionally substituted with cyclopentyl, cyclobutyl or cyclopropyl.

In the liquid crystal composition of the present disclosure, preferably, the total mass content of the compound represented by the aforementioned formula I is 1-65% based on the sum of the components other than the polymerizable compound being 100% by mass; the compound represented by the aforementioned formula II The total mass content of the compound is 1-20%; the total mass content of the compound represented by the aforementioned formula III is 1-25%; the polymerizable compound is added on the basis of the total mass % of the liquid crystal, and the aforementioned polymerizable compound is added in an amount of 0.01 -1%, preferably 0.03-0.2%; the total mass content of the compound represented by the aforementioned formula IV is 0-50%.

The liquid crystal composition of the present disclosure preferably further comprises one or more compounds represented by formula V:

各自獨立地表示1,4-亞環己基、1,4-亞環己烯基或1,4-亞苯基；且

同時表示1,4-亞環己基時，R₅或R₆其中之一表示丙基時，另一個不表示乙烯基。 Among them, R ₅ and R ₆ represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or a carbon atom substituted with fluorine An alkoxy group with 1-10 carbon atoms, an alkenyl group with 2-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms substituted by fluorine;

each independently represent 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-phenylene; and

When representing 1,4-cyclohexylene at the same time, when one of R ₅ or R ₆ represents a propyl group, the other does not represent a vinyl group.

In the liquid crystal composition disclosed in the present disclosure, preferably, the compound represented by the aforementioned formula V is selected from the group consisting of compounds represented by the following formulas V-1 to V-3:

Among them, R ₅ and R ₆ represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or a carbon atom substituted with fluorine An alkoxy group with a number of 1-10, an alkenyl group with a carbon number of 2-10, or an alkenyl group with a carbon number of 2-10 substituted by fluorine; in formula V-1, in R ₅ and R ₆ When one of them represents a propyl group, the other does not represent a vinyl group.

In the liquid crystal composition disclosed in the present disclosure, preferably, the aforementioned liquid crystal composition further comprises one or more compounds represented by formula VI:

各自獨立地表示1,4-亞環己基、1,4-亞環己烯基或1,4-亞苯基。 Wherein, R ₇ represents an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine. -10 alkoxyl group, alkenyl group with 2-10 carbon atoms, alkenyl group with 2-10 carbon atoms substituted by fluorine; _R8 represents alkyl group with 1-10 carbon atoms, fluorine substituted An alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine;

Each independently represents a 1,4-cyclohexylene group, a 1,4-cyclohexenylene group, or a 1,4-phenylene group.

In the liquid crystal composition disclosed in the present disclosure, preferably, the compound represented by the aforementioned formula VI is selected from the group consisting of compounds represented by the following formulas VI-1 to VI-3:

Wherein, R ₇ represents an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine. -10 alkoxyl group, alkenyl group with 2-10 carbon atoms, alkenyl group with 2-10 carbon atoms substituted by fluorine; _R8 represents alkyl group with 1-10 carbon atoms, fluorine substituted An alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and an alkoxy group with 1-10 carbon atoms substituted by fluorine.

In the liquid crystal composition of the present disclosure, preferably, one or more compounds represented by formula VII are further included:

Wherein, R ₉ represents an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxyl group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine. 1-10 alkoxy groups, any one or more unconnected CH ₂ in these groups are optionally substituted by cyclopentyl, cyclobutyl or cyclopropyl; R ₁₀ represents an alkyl group with 1-10 atoms , an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine; X represents O or S.

其中，R₉₁、R₁₀₁表示碳原子數為1-10的烷基。 In the liquid crystal composition disclosed in the present disclosure, preferably, the compound represented by the aforementioned formula VII is selected from the group consisting of compounds represented by the following formulas VII-1 to VII-12:

Wherein, R ₉₁ and R ₁₀₁ represent an alkyl group with 1-10 carbon atoms.

[Liquid crystal display element or liquid crystal display]

The present disclosure also relates to a liquid crystal display element or a liquid crystal display comprising any one of the above-mentioned liquid crystal compositions; the display element or display is an active matrix display element or display or a passive matrix display element or display.

Optionally, the liquid crystal display element or liquid crystal display is preferably an active matrix liquid crystal display element or liquid crystal display.

Optionally, the active matrix display element or display is a PSVA-TFT liquid crystal display element or display.

The liquid crystal display element or liquid crystal display comprising the aforementioned compound or liquid crystal composition has a wider nematic phase temperature range, faster response speed, and lower cell thickness.

Example

In order to illustrate the present disclosure more clearly, the present disclosure will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the scope of protection of the present disclosure.

In this manual, unless otherwise specified, the percentages refer to mass percentages, and the temperature is in degrees Celsius (°C). The specific meanings and test conditions of other symbols are as follows: Cp means liquid crystal clearing point (°C), tested by DSC quantitative method; △n means Optical anisotropy, n _o is the refractive index of ordinary light, _ne is the refractive index of extraordinary light, the test condition is 25±2°C, 589nm, tested by Abbe refractometer; △ε means dielectric anisotropy, △ ε=ε _∥ -ε _⊥ , where, ε _∥ is the dielectric constant parallel to the molecular axis, ε _⊥ is the dielectric constant perpendicular to the molecular axis, the test condition is 25±0.5℃, 20 micron parallel box, INSTEC: ALCT -IR1 test; γ1 represents the rotational viscosity (mPa.s), the test condition is 25±0.5°C, 20 micron parallel box, INSTEC: ALCT-IR1 test; K11 is the torsional elastic constant, K33 is the splay elastic constant, the test condition is : 25°C, INSTEC: ALCT-IR1, 18 micron vertical cell; the preparation method of the liquid crystal composition is as follows: put each liquid crystal monomer into a stainless steel beaker after weighing according to a certain ratio, and put the stainless steel beaker containing each liquid crystal monomer The beaker is placed on a magnetic stirring apparatus to heat and melt. After most of the liquid crystal monomers in the stainless steel beaker are melted, a magnetic rotor is added to the stainless steel beaker, the mixture is stirred evenly, and the liquid crystal composition is obtained after cooling to room temperature.

The structure of the liquid crystal monomer in the disclosed embodiment is represented by a code, and the code representation methods of the liquid crystal ring structure, terminal group, and linking group are shown in Table 1 and Table 2 below.

Table 1 Corresponding codes of the ring structure

，其代碼為CC-Cp-V1；

，其代碼為CPY-2-O2；

，其代碼為CCY-3-O2；

，其代碼為COY-3-O2；

，其代碼為CCOY-3-O2；

，其代碼為Sb-Cp1O-O4；

，其代碼為Sc-Cp1O-O4。 Example:

, whose code is CC-Cp-V1;

, whose code is CPY-2-O2;

, whose code is CCY-3-O2;

, whose code is COY-3-O2;

, whose code is CCOY-3-O2;

, whose code is Sb-Cp1O-O4;

, whose code is Sc-Cp1O-O4.

Example 1

The formula and corresponding properties of the liquid crystal composition are shown in Table 3 below.

Comparative example 1

The formula and corresponding properties of the liquid crystal composition are shown in Table 4 below.

CC-3-V in Example 1 was replaced by CC-5-V as Comparative Example 1. Compared with Comparative Example 1, Example 1 has crystals precipitated at room temperature, and the rotational viscosity increases, and K33 increases slightly, but γ1/K33 increases, and the response becomes slower. It can be seen that the liquid crystal composition disclosed in the present disclosure has the characteristics of suitable optical anisotropy, good low-temperature mutual solubility, and fast response speed.

Comparative example 2

The formula and corresponding properties of the liquid crystal composition are shown in Table 5 below.

Replace CPP-3-2V1 in Example 1 with CPP-3-2 as Comparative Example 2. Compared with Comparative Example 2 in Example 1, the refractive index of Comparative Example 2 becomes smaller, the clearing point decreases, and the K value decreases. It can be seen that the liquid crystal composition disclosed in the present disclosure has the characteristics of suitable optical anisotropy and wide temperature display range.

Comparative example 3

The formula and corresponding properties of the liquid crystal composition are shown in Table 6 below.

PY-2O-O4, PY-2O-O2, PY-1O-O4 in Example 1 were replaced by PY-3-O2, PY-5-O2 as Comparative Example 3. Compared with Example 3, Example 1 has lower dielectric, lower refractive index, and lower clearing point of Comparative Example 3. It can be seen that the liquid crystal composition of the present invention has the characteristics of suitable dielectric anisotropy and optical anisotropy, and a wide temperature display range.

Example 2

The formula and corresponding properties of the liquid crystal composition are shown in Table 7 below.

Example 3

The formula and corresponding properties of the liquid crystal composition are shown in Table 8 below.

Example 4

The formula and corresponding properties of the liquid crystal composition are shown in Table 9 below.

Example 5

The formula and corresponding properties of the liquid crystal composition are shown in Table 10 below.

Example 6

The formula and corresponding properties of the liquid crystal composition are shown in Table 11 below.

Example 7

The formula and corresponding properties of the liquid crystal composition are shown in Table 12 below.

Example 8

The formula and corresponding properties of the liquid crystal composition are shown in Table 13 below.

Example 9

The formula and corresponding properties of the liquid crystal composition are shown in Table 14 below.

Comparative example 4

The formula and corresponding properties of the liquid crystal composition are shown in Table 15 below.

Table 15 Formula and corresponding properties of the liquid crystal composition of Comparative Example 4

Replace CPP-3-2V1 in Example 9 with CPP-3-2 as Comparative Example 4. Compared with Example 9, the refractive index of Comparative Example 4 becomes smaller, the clearing point decreases, the use temperature of the liquid crystal becomes narrower, the γ1/K33 becomes larger, and the response becomes slower. It can be seen that the liquid crystal composition disclosed in the present disclosure has the characteristics of large refractive index, wide display temperature and fast response.

Example 10

The formula and corresponding properties of the liquid crystal composition are shown in Table 16 below.

Comparative example 5

The formula and corresponding properties of the liquid crystal composition are shown in Table 17 below.

Replace CC-3-V in Example 10 with CC-5-V as Comparative Example 5. Compared with Example 10, Comparative Example 5 has smaller differences in dielectric properties, refractive index, and clearing point properties, but the γ1/K33 becomes larger and the response becomes slower. It can be seen that the liquid crystal composition of the present disclosure has the characteristics of fast response.

Example 11

The formula and corresponding properties of the liquid crystal composition are shown in Table 18 below.

Table 18 The formula of embodiment 11 liquid crystal composition and corresponding performance

Example 12

The formula and corresponding properties of the liquid crystal composition are shown in Table 19 below.

Example 13

The formula and corresponding properties of the liquid crystal composition are shown in Table 20 below.

Comparative example 6

The formula and corresponding properties of the liquid crystal composition are shown in Table 21 below.

Replace CPP-3-2V1 in Example 13 with CPP-5-2 as Comparative Example 6. Compared with Example 13, the refractive index of Comparative Example 6 becomes smaller, the clearing point decreases, the use temperature of the liquid crystal becomes narrower, the γ1/K33 becomes larger, and the response becomes slower. It can be seen that the liquid crystal composition disclosed in the present disclosure has the characteristics of large refractive index, wide display temperature and fast response. Moreover, the liquid crystal composition disclosed in the present disclosure is used in the manufacturing process of the ODF liquid crystal element, and the liquid crystal display has no defective display.

Example 14

The formula and corresponding properties of the liquid crystal composition are shown in Table 22 below.

Example 15

The formula and corresponding properties of the liquid crystal composition are shown in Table 23 below.

Apparently, the above-mentioned embodiments of the present disclosure are only examples for clearly illustrating the present disclosure, and are not intended to limit the implementation of the present disclosure. Changes or changes in other forms cannot be exhaustively listed here, and any obvious changes or changes derived from the technical solutions of the present disclosure are still within the scope of protection of the present disclosure.

Claims (9)

A liquid crystal composition comprising a compound represented by formula I, a compound represented by formula II, one or more compounds represented by formula III, one or more compounds represented by formula IV-2, IV-4, and IV-5 , and at least one polymerizable compound,

In formula III, R ₁ represents an alkoxy group with 2 carbon atoms, R ₂ represents an alkoxy group with 2 or 4 carbon atoms; R ₃₁ represents an alkyl group with 2 or 3 carbon atoms, and R ₄₁ represents a carbon An alkoxy group with 2 or 4 atoms; wherein, the mass content of the compound shown in Formula I is 25%, the mass content of the compound shown in Formula III is 15%, and the mass content of the compound shown in Formula IV-2 is 14%. , the mass content of the compound shown in Formula IV-4 is 20%, and the mass content of the compound shown in Formula IV-5 is 11%. The liquid crystal composition as described in Claim 1, further comprising a group consisting of one or more compounds represented by formulas IV-1, IV-3, IV-6 to IV-14:

Wherein: R ₃₁ represents an alkyl group with 2 or 3 carbon atoms; R ₄₁ represents an alkoxy group with 2 or 4 carbon atoms. The liquid crystal composition as described in Claim 1, which further comprises one or more compounds represented by formula V:

In formula V, R ₅ and R ₆ represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, a fluorine-substituted An alkoxy group with 1-10 carbon atoms, an alkenyl group with 2-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms substituted by fluorine;

each independently represent 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-phenylene; and

When representing 1,4-cyclohexylene at the same time, when one of R ₅ and R ₆ represents a propyl group, the other does not represent a vinyl group. The liquid crystal composition as claimed in item 3, wherein the one or more compounds represented by formula V are selected from the group consisting of compounds represented by formulas V-1 to V-3:

Among them, R ₅ and R ₆ represent an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or a carbon atom substituted with fluorine An alkoxy group with a number of 1-10, an alkenyl group with a carbon number of 2-10, or an alkenyl group with a carbon number of 2-10 substituted by fluorine; in formula V-1, in R ₅ and R ₆ When one of them represents a propyl group, the other does not represent a vinyl group. The liquid crystal composition as described in claim item 1, which further comprises one or more compounds shown in formula VI:

In formula VI, R ₇ represents an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxyl group with 1-10 carbon atoms, or a carbon number substituted with fluorine An alkoxy group with 1-10 carbon atoms, an alkenyl group with 2-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms substituted by fluorine; _R represents an alkyl group with 1-10 carbon atoms , an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine;

Each independently represents a 1,4-cyclohexylene group, a 1,4-cyclohexenylene group, or a 1,4-phenylene group. The liquid crystal composition as claimed in item 5, wherein the one or more compounds represented by formula VI are selected from the group consisting of compounds represented by formula VI-1 to VI-3:

Wherein, R ₇ represents an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxy group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine. -10 alkoxyl group, alkenyl group with 2-10 carbon atoms, alkenyl group with 2-10 carbon atoms substituted by fluorine; _R8 represents alkyl group with 1-10 carbon atoms, fluorine substituted An alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine. The liquid crystal composition as claimed in item 1, which further comprises one or more compounds represented by formula VII:

In formula VII, R ₉ represents an alkyl group with 1-10 carbon atoms, an alkyl group with 1-10 carbon atoms substituted by fluorine, an alkoxyl group with 1-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms substituted by fluorine is an alkoxy group of 1-10, any one or more unconnected CH ₂ in the group represented by R ₉ is optionally substituted by cyclopentyl, cyclobutyl or cyclopropyl; R ₁₀ represents that the number of atoms is 1- 10 alkyl, fluorine-substituted alkyl with 1-10 carbon atoms, alkoxy with 1-10 carbon atoms, fluorine-substituted alkoxy with 1-10 carbon atoms; X represents O or S. The liquid crystal composition as claimed in item 7, wherein the one or more compounds represented by formula VII are selected from the group consisting of compounds represented by formula VII-1 to VII-12:

Wherein, R ₉₁ and R ₁₀₁ each independently represent an alkyl group with 1-10 carbon atoms. A liquid crystal display element or a liquid crystal display, which comprises the liquid crystal composition as described in any one of claims 1-8, the liquid crystal display element or the liquid crystal display is an active matrix addressing display element or a display, or a passive matrix addressing A display element or monitor.